celery broken after upgrade

I decided to update some packages in the virtualenv for my Django project but in doing so I seem to have broken celery.  After upgrading to the latest version, I now get this TypeError when calling a view that also submits a celery job with my_func.delay()  Here's the error I get:   

set([]) is not JSON serializable

I upgraded to:

celery==3.0.12

django-celery==3.0.11

Several dependencies were also upgraded: billiard python-dateutil kombu pytz anyjson amqp importlib ordereddict

Has anyone else seen this with the latest version of celery?

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